Hoisting device



Patented June 19, 1951 UNITED STATES E ATENT OFFICE 3 Claims.-

1 The present invention relates to a portable hoisting device and it particularly relates to a light weight hoisting device which may be conveniently utilized in hoisting construction materials during construction or repair of buildings and readily moved from floor to floor.

It is among the objects of the present invention to provide a simple, inexpensive durable material hoisting device which may be readily placed upon building constructions and which may be utilized to hoist materials at least up to Iour stories in height.

Another object is to provide a simple inexpensive hoisting device which may be readily installed and operated by one or two men without the necessity of building expensive elevators and without requiring services of carpenters to build elevator shafts.

Another object is to provide a simple inexpensive electrically operated material hoist which may be set up in a short period of two hours and which may be conveniently used for hoisting construction materials including concrete or cement blocks, steel framework, brick mortar, window frames, radiators, and so forth up to the upper floors.

Still further objects and advantages will appear in the more detailed description set forth below, it being understood, however, that this more detailed description is given by way of illustration and explanation only and not by way of limitation, since various changes therein may be made by those skilled in the art without departing from the scope and spirit of the present invention. f

The above objects are most satisfactorily accomplished by providing a rotatable boom structure mounted on a central post. The boom carries and is balanced by a motor, clutch and brake structure designed to be positioned over and extend beyond the central bearing post. The boom is pivotally mounted on the top of the central post by a cap and by a detachable collar attached to the lower part of the boom structure.

Desirably brake and clutch structures are mounted on one shaft manually actuated by separate angularly spaced levers and are positioned in readily accessible position at one side of the machine. The first shaft drives a parallel winch drum shaft. The motor shaft is at right angles to the first shaft and is connected to drive said shaft by bevel reduction gears.

The invention also consists in certain new and original features of construction and combination of parts hereinafter set forth and claimed as to its other objects, features and advantages, the mode of operation and manner of its organization, these, inter alia, may be better understood by referring to the following description considered in connection with the accompanying drawings forming a part thereof in which:

Fig. l is a side perspective view of the hoisting device according to one embodiment of the present invention;

Fig. 2 is a side elevational view showing the detail construction, and

Fig. 3 is a top plan view.

Referring to Fig. 1 there is a base structure A, a rotatable boom structure B and an electric motor drive construction C and a winch construction D.

The base structure A has a base plate II) with inclined sides II and a back l2 carrying the angle member [3. The post or vertical pivotal mount member I4 is supported by the inclined base members 15 which are welded at IE to the post [4, The boom rides on the post M by the lower bearing sleeve I! and the upper cap member l8.

The lower bearing member ll has an outi wardly extending flange [9 which is bolted at to the flange 2| extending horizontally toward the post ill from the lower ends 22 of the lower structure members or angle beams 23 of the boom structure B. By removing the bolts 20 it is possible to separate the flanges I9 and 2| of the upper boom structural members 25 which also consist of forwardly and upwardly angle members. The angle members 23 and 25 are joined together at their upper ends by welding or by bolts or rivets 26. The top plate 2! may be welded to the upper flanges 28 of said angle beams 25.

Between the angle members 23 and 25 there extends the vertical brace members 29, the horizontal brace members 30 and the vertical brace members 3|. The ends of these brace members 29, 30 and 3| are welded or bolted to the top and bottom flanges 28 and 32 of the angle beams 23 and 25 or to the side flanges 33 and 34 thereof. It will be noted that the lower angle members 33 are bent at H so that the edges of the vertical flanges 33 and 34 will contact at 35 and may then be welded together to give a most rigid structure.

On the lower ends of the horizontal flanges 28 of the beams 25 is positioned the base member 36. The member 35 carries the upwardly extending frame structure 3'? (see Fig. 2) having the flanges 38 and 39 bolted at 45 and 5| to the spacer blocks 42 and 43 and the flanges 28.

The U-member 37 carries the bearing members 44 and 45 which carry the shafts 46 and 41 (see Fig. 2). These bearing members 4% and 45 are provided with the flanges 43 and 4S bolted down at 50 and 5| (see Fig. 3). The other ends of the shafts are carried by the bearings 52 and 53 having the flanges 54 which are bolted down at 56 and 51.

The shaft t6 carries the cable drum 58 (see Figs. 2 and 3) carrying the cable 59 which leads to the pulley 5G. The end of the cable 59 is connected to the wheel Si by the loop 62 formed by the clip 63. The wheel 6! has a cross member 64 mounted on the pin 65. The pin 65 carries a loop 66. The loop 6'5 passes through the eye 6! of the hook 68 to which may be attached the handle 59 of the bucket lil. The hook also may be used for carrying grapples or for other purposes, such as moving cement or concrete blocks, steel framework and so forth.

The drum 58 is driven by a large gear 90 on the shaft 45 which meshes with the small pinion 9| on the shaft #1. The pinion 9! is driven on the shaft A! by the bevel gear 92. The bevel gear 92 is driven by the small bevel gear 93 which is connected by the shaft 94 extending through the motor bearing 95.

The motor 96 may consist of a small 1 /2 H. P. motor rotating at 1750 R. P. M. with a reduction of 4 to 1 from the motor shaft 91 to the intermediate shaft 4'! and another reduction of 4 to 1 from the shaft 41 to the main drum shaft 46. The motor base 98 has the flanges 99 bolted at I to the plate IHI. The plate IQI is mounted on the side channels I 02.

The channels I02 interiorly receive the plate I83 on their inturned bottom flanges H14. The entire box structure IOI, H32 and I53 is mounted by the brackets H35 from the structural element I06. The structural element I06 is mounted on the plate 36.

The forward plate I07 and the rear plate I06 (see Fig. 1) support the brake structure E and the clutch structure F.

As shown in Fig. 1 the brake structure E consists of a drum I28 on the shaft I69 on the same axis as the shaft 47. The drum W8 is encircled by a brake band Ill! which is normally held in active position by the spring I l reacting against the flange H2 of the bracket H3. The handle H4! is connected by the pivotal connection H to the shoe H5. The shoe H6 is mounted on the plate in of the end I I 8 of the brake band HE. By pulling the handle H4 in the direction HS (see Fig. 1), it is possible to compress the spring HI and stop the drum H38.

In respect to the clutch F, the clutch disks I3t! (see Fig. 3) connected to the bevel gear 92 may cause the bevel gears 92 and S3 to disengage. These clutch disks lei are operated by the grooved element I3I which receives the finger I32 at the end of the extension I34 of the clutch handle I 35. The clutch handle I 35 is pivotally mounted at 533 on the bracket N35. The handle I35 is provided with the two hand contact members I36 riveted or bolted together at I31.

In operation, the motor C operates continuously and the drum 58 may be operated and stopped by operation of the levers I35 and Il controlling the brake and clutch mechanisms respectively. a

The motor C and box I01, I02 and I03 will counterbalance the boom B, and the clutch structure F, brake structure E and winch structure 56 will place suificient weight directly on post I4 to enable the entire boom readily to be rotated. The cap bearing I8 and sleeve bearing I! may be provided with grease nipples.

The boom B may be readily lifted from the post I l together with motor C, clutch F and brake E by removing bolts 20.

During tests made at a height of 30 feet, the machine as shown lifted 350 pounds or the equivalent of a full wheelbarrow of concrete and returned the hook to the ground, ready to receive another load in a total lapsed time of one minute. The machine as shown will lift a 400 pound load a height of '75 feet within one minute.

The load limit of the machine is 400 pounds using a 1 H. P. eiectric motor. Heavier loads can be lifted by employing a larger motor.

As many changes could be made in the above lightweight portable hoisting device and many apparently widely different embodiments of this invention could be made without departing from the scope of the claims, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

What is claimed is:

l. A crane comprising a base, a vertical post upon said base, braces extending upwardly from said base at an incline towards said post and having their upper ends secured to the post in downwardly spaced relation to the. upper end thereof, a boom extending from said post radially thereof at an upward incline and having transversely spaced upper beams and transversely spaced lower beams, the lower beams extending outwardly in converging relation to the upper beams and having inner ends spaced downwardly from inner ends of the upper beams and their outer ends rigidly secured to outer ends of the upper beams, there being struts between the upper and lower beams, a cap carried by inner end portions of the upper beams and constituting a bearing rotatably fitting about the upper end of said post above said braces and shiftable upwardly off of the post, a collar loosely fitting about said post below the braces and detachably connected with inner ends of the lower beams, a pulley at the outer end of said boom, a supporting structure mounted over rear portions of the upper beams, a drum on said supporting structure, a cable wound about said drum and extending towards the outer ends of the upper beams and downwardly about said pulley and carrying a load engaging member at its free end, a motor support carried by the inner ends of the upper beams and projecting from the post longi-- tudinally of the boom at the opposite side of the post from the boom, a motor mounted on said motor support, and mechanism carried by saidsupporting structure for transmitting rotary motion from said motor to said drum.

2. A crane comprising a base, a vertical post rising from said base and braced by diagonal braces extending upwardly from the base and having upper ends secured to the upper portion I of the post. a boom extending from the post radially thereof at an upward incline and includspaced vertically from each other, a cap carried by the rear ends of the upper member and rotatably fitting about the upper end of said post above said braces and being movable upwardly 01? of the post, a collar loosely fitting about said post below the braces and constituting a bearing detachably connected with the rear end of the lower member, a supporting structure extending upwardly from the rear portion of the upper member, a drum rotatably carried by said supporting structure forwardly of the post, a cable wound about said drum and extending towards the front end of the boom and downwardly therefrom and having a load carrier at its free end, a motor support extending from the upper member and projecting radially from the post at the opposite side thereof from the boom, a motor mounted upon said motor support and constituting a counterweight for the boom, and mechanism upon said supporting structure back of said drum constituting means for transmitting rotary motion from said motor to said drum.

3. A crane comprising a vertical post, a boom extending from said post at an upward incline and mounted for swinging movement about the post, a supporting structure mounted over the rear end portion of said boom, a drum mounted upon said supporting structure forwardly of the post, a. cable wound about said drum and extending therefrom along said boom to the front end thereof and downwardly and provided with load engaging means at its front end, a motor support extending from the rear end of said boom longitudinally thereof and projecting from the post at the opposite side thereof from the boom, a motor upon said motor support constituting a counterbalance for the boom, mechanism upon the supporting structure for transmitting rotary motion from said motor to said drum, said motor support consisting of a hollow casing open at its rear end whereby weights may be placed within the casing and assist counterbalancing of the boom.

SAMUEL WINKE'L.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 920,107 Bolin May 4, 1909 1,026,901 Brown May 21, 1912 1,111,416 Taylor Sept. 22, 1914 1,407,855 Green Feb. 28, 1922 1,650,656 Sasgen Nov. 29, 1927 2,082,017 McClain June 1, 1937 

